Title :
Decentralized design of robust power system stabilizers considering system uncertainties
Author :
Dechanupaprittha, S. ; Ngamroo, I. ; Mitani, Y.
Author_Institution :
Kyushu Inst. of Technol., Fukuoka
Abstract :
Various operating conditions, nonlinearity effects etc. cause several system uncertainties. The conventional lead/lag power system stabilizers (PSSs) which are designed without considering such uncertainties may deteriorate a system robust stability. As a result, PSSs may fail to damp electromechanical oscillations. To tackle this problem, this paper focuses on a new decentralized control design of robust PSSs considering system uncertainties. Scalar uncertainty models are included in a system representation. Accordingly, the stability margin of the controlled system can be determined in terms of the guaranteed multi-input multi-output (MIMO) gain margin (GM) and phase margin (PM). To achieve the guaranteed MIMO GM and PM, the tabu search is employed to search for optimum parameters of PSSs. The objective function is formulated based on a minimization of infinite norms of a closed-loop control system and a complementary sensitivity function. Consequently, nonlinear simulation studies of the New England power system confirm the robustness of the designed PSSs against system uncertainties.
Keywords :
MIMO systems; closed loop systems; decentralised control; nonlinear control systems; power system control; power system stability; robust control; search problems; sensitivity analysis; uncertain systems; MIMO gain margin; New England power system; closed-loop control system; decentralized control design; electromechanical oscillations; lead-lag power system stabilizers; multiinput multioutput; nonlinear simulation; nonlinearity effects; objective function; phase margin; robust power system stabilizers; scalar uncertainty models; sensitivity function; system representation; system robust stability; system uncertainties; tabu search; Control systems; Distributed control; MIMO; Power system modeling; Power system simulation; Power system stability; Power systems; Robust stability; Robustness; Uncertainty; Power system stabilizer; guaranteed MIMO gain margin and phase margin; robust control; system uncertainties; tabu search;
Conference_Titel :
Power Tech, 2005 IEEE Russia
Conference_Location :
St. Petersburg
Print_ISBN :
978-5-93208-034-4
Electronic_ISBN :
978-5-93208-034-4
DOI :
10.1109/PTC.2005.4524556
